fix signed warning
fix signed warning

ffainelli/uClibc,kraj/uclibc-ng,czankel/xtensa-uclibc,hjl-tools/uClibc,ffainelli/uClibc,atgreen/uClibc-moxie,czankel/xtensa-uclibc,klee/klee-uclibc,hjl-tools/uClibc,hwoarang/uClibc,ddcc/klee-uclibc-0.9.33.2,hwoarang/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,hwoarang/uClibc,ddcc/klee-uclibc-0.9.33.2,foss-for-synopsys-dwc-arc-processors/uClibc,majek/uclibc-vx32,hjl-tools/uClibc,mephi42/uClibc,OpenInkpot-archive/iplinux-uclibc,wbx-github/uclibc-ng,gittup/uClibc,waweber/uclibc-clang,brgl/uclibc-ng,mephi42/uClibc,brgl/uclibc-ng,ffainelli/uClibc,klee/klee-uclibc,hwoarang/uClibc,kraj/uClibc,waweber/uclibc-clang,klee/klee-uclibc,ysat0/uClibc,wbx-github/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,ysat0/uClibc,ChickenRunjyd/klee-uclibc,OpenInkpot-archive/iplinux-uclibc,OpenInkpot-archive/iplinux-uclibc,ffainelli/uClibc,skristiansson/uClibc-or1k,kraj/uclibc-ng,ndmsystems/uClibc,kraj/uClibc,groundwater/uClibc,foss-xtensa/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,majek/uclibc-vx32,ndmsystems/uClibc,gittup/uClibc,waweber/uclibc-clang,waweber/uclibc-clang,m-labs/uclibc-lm32,ChickenRunjyd/klee-uclibc,gittup/uClibc,groundwater/uClibc,m-labs/uclibc-lm32,mephi42/uClibc,OpenInkpot-archive/iplinux-uclibc,skristiansson/uClibc-or1k,mephi42/uClibc,kraj/uClibc,ChickenRunjyd/klee-uclibc,majek/uclibc-vx32,kraj/uClibc,ysat0/uClibc,atgreen/uClibc-moxie,skristiansson/uClibc-or1k,foss-xtensa/uClibc,majek/uclibc-vx32,kraj/uclibc-ng,ChickenRunjyd/klee-uclibc,groundwater/uClibc,skristiansson/uClibc-or1k,brgl/uclibc-ng,hjl-tools/uClibc,m-labs/uclibc-lm32,gittup/uClibc,groundwater/uClibc,atgreen/uClibc-moxie,foss-xtensa/uClibc,ndmsystems/uClibc,ndmsystems/uClibc,wbx-github/uclibc-ng,klee/klee-uclibc,ysat0/uClibc,czankel/xtensa-uclibc,m-labs/uclibc-lm32,ffainelli/uClibc,czankel/xtensa-uclibc,atgreen/uClibc-moxie,foss-xtensa/uClibc,hjl-tools/uClibc,ddcc/klee-uclibc-0.9.33.2,groundwater/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,ddcc/klee-uclibc-0.9.33.2,kraj/uclibc-ng